compression calculation

[aarion]

Hi, i was wondering how to calculate compression ratio. My current na is running on 15:1 compression and i planning to turbo charged it. I'm using a standard 1mm gasket.

If i use a 2mm metal head gasket, how much will the compression be reduced? Please give me some light into this matter. Thank you.

 

[Joeker]

To calculate Static compression ratio, need to know the block's bore, stroke and head's dome volume.

Or

Do it manually at workshop using a pc of glass panel and brake fluid,

Formula, (c + hv) / hv

Eg.

Piston@BDC, 500ml, being c.

Head's dome + head gasket, 50ml, being hv.

(500 + 50) / 50 = 11

Therefore, static compression is 11 : 1

BTW, your compression 15 : 1? CI engine?

 

[azameel]

Bout compression ratio.
just sharing
me oso pening :stupid:



Compression ratio - Wikipedia, the free encyclopedia

 

[aarion]

i'm running a 4g93p block with Mivec head. Using 4g92p high comp pistons.

bore will be 82 and stroke is 89. but don't have the dome volume.

 

[cooljas]

i'm running a 4g93p block with Mivec head. Using 4g92p high comp pistons.

bore will be 82 and stroke is 89. but don't have the dome volume.

15:1 is not ur compression ratio....tat is ur compression test results!I think if u use the 4g92p piston on a 1.8block...the CR should be around 11.X:1

 

[aarion]

meaning? that's what the meter said.

 

[kwai]

ya, anyone know how to convert frm compression psi to ratio? :)

 

[CarroTT]

waaaaarr, 15:1 , engine diesel arr ?

here is a very useful tool that i use frequently,
Engine Calculator...

15 bar izzit ? :hmmmm:
at wat rpm ?

 

[wira_tak_laju]

if i am not mistaken..depends on which 92 piston u r running..3 version of 92pistons..92d-h frm local 1.6,92d-e frm 92 dohc non mivec and 92d-v frm mivec...since u turbochrging,why not use ur 93 pistons as its alredy 10.5.1 ratio..then either 1.5mm or 1.8mm to reduce the compression for safe application

 

[aarion]

i think is our 4g92 local.

 

[cooljas]

if i am not mistaken..depends on which 92 piston u r running..3 version of 92pistons..92d-h frm local 1.6,92d-e frm 92 dohc non mivec and 92d-v frm mivec...since u turbochrging,why not use ur 93 pistons as its alredy 10.5.1 ratio..then either 1.5mm or 1.8mm to reduce the compression for safe application

Bro, u got the codes wrong......92d-h is from 1.6dohc non mivec, 92s-h is from 1.6sohc(local), 92d-v from mivec.......

 

[wira_tak_laju]

iyela....silap..thnx for correcting